So, this video may help you a little bit on that: https://www.youtube.com/watch?v=-GrrrJWkEpM Also, I've once read that Portuguese people pronounce more strongly the consonants of the words, while Brazilians tend to enunciate more the vowels. Brazilians use the gerund (gerúndio) form of verbs while Portuguese people don't. So to say something like "We are dancing" would go like this: PT) "Estamos a dançar." BR) "Estamos dançando." The melody of both accents is also very different (and that's also true for other accents within each of these two groups as well) but you can only pick that up by listening to a lot of Portuguese! I hope that helps and if I remember anything else I'll post it in here.
